White-tailed deer are highly variable in size, generally larger the further away from the Equator that it is found. North American male deer (also known as a buck or stag) usually weighs 130 to 290 lbs. but, in rare cases, bucks in excess of 350 lbs. have been recorded. Mature bucks over 400 pounds are recorded in the northernmost reaches of their native range, specifically, Minnesota and Ontario.